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Dumfries and Galloway Coast Habits Survey 2012 Radiological Habits Survey: Dumfries and Galloway Coast, 2012 This page has been intentionally left blank Environment Report RL 25/13 Final report Radiological Habits Survey: Dumfries and Galloway Coast, 2012 C.J. Garrod, F.J. Clyne, V.E. Ly and G.P. Papworth Peer reviewed by G.J. Hunt Approved for publication by W.C. Camplin 2013 The work described in this report was carried out under contract to the Scottish Environment Protection Agency SEPA contract R90077PUR Cefas contract C3745 This report should be cited as: Garrod, C.J., Clyne, F.J., Ly, V.E. and Papworth, G.P., 2013. Radiological Habits Survey: Dumfries and Galloway Coast, 2012. RL 25/13. Cefas, Lowestoft A copy can be obtained by downloading from the SEPA website: www.sepa.org.uk and from the Cefas website: www.cefas.defra.gov.uk © Crown copyright, 2013 Page 2 of 49 Radiological Habits Survey: Dumfries and Galloway Coast, 2012 CONTENTS SUMMARY .............................................................................................................................................. 5 1 INTRODUCTION ............................................................................................................................. 9 1.1 Regulation of radioactive waste discharges ............................................................................ 9 1.2 The representative person ...................................................................................................... 9 1.3 Dose limits and constraints ................................................................................................... 10 2 THE SURVEY ............................................................................................................................... 11 2.1 Survey aims ........................................................................................................................... 11 2.2 Survey area ........................................................................................................................... 11 Figure 1. The survey area ............................................................................................................. 12 2.4 Conduct of the survey ........................................................................................................... 13 3 METHODS FOR DATA ANALYSIS ............................................................................................. 14 3.1 Data recording and presentation ........................................................................................... 14 3.2 Data conversion .................................................................................................................... 14 3.3 Rounding and grouping of data ............................................................................................. 14 3.4 Approaches for the identification of high rates ...................................................................... 15 3.5 Infant and child ratios for use in dose assessments ............................................................. 16 4 AQUATIC RADIATION PATHWAYS ........................................................................................... 17 4.1 Description of the survey area .............................................................................................. 17 Figure 2. Rigg Bay ........................................................................................................................ 18 Figure 3. Innerwell ........................................................................................................................ 19 Figure 4. Mossyard Bay ................................................................................................................ 20 Figure 5. Ardwall Isle from Isle Mouth .......................................................................................... 21 Figure 6. Brighouse Bay ............................................................................................................... 22 Figure 7. Rascarrel Bay ................................................................................................................ 24 Figure 8. Balcary Point ................................................................................................................. 25 Figure 9. Rockcliffe ....................................................................................................................... 26 Figure 10. Sandyhills Bay ............................................................................................................. 27 Figure 11. The River Nith .............................................................................................................. 28 4.2 Commercial fisheries ............................................................................................................. 28 4.3 Destination of seafood originating from the aquatic survey area .......................................... 29 4.4 Hobby fishing, angling and non-commercial shellfish collecting ........................................... 30 4.5 Wildfowling ............................................................................................................................ 30 4.6 Other pathways ..................................................................................................................... 31 4.7 The use of seaweed for livestock feed or fertiliser ................................................................ 31 4.8 Internal exposure .................................................................................................................. 31 Table A. Summary of adults’ consumption rates of foods from the survey area .......................... 32 Table B. Summary of children’s and infants’ consumption rates of foods from the survey area... 33 4.8 External exposure ................................................................................................................. 34 Table C. Summary of adults’ intertidal occupancy rates .............................................................. 34 Table D. Summary of children’s and infants’ intertidal occupancy rates ...................................... 35 Table E. Summary of adults’ handling rates of fishing gear and sediment .................................. 37 Table F. Summary of children’s handling rates of sediment ........................................................ 37 5 USE OF HABITS DATA FOR DOSE ASSESSMENTS ............................................................... 39 6 COMPARISONS WITH THE PREVIOUS SURVEY ..................................................................... 40 Table G. Comparison between 2007 and 2012 consumption rates of aquatic food groups for adults ............................................................................................................................................. 40 Table H. Comparison between 2007 and 2012 intertidal occupancy rates and handling rates of fishing gear and sediments for adults ............................................................................... 41 7 MAIN FINDINGS ........................................................................................................................... 43 Page 3 of 49 CONTENTS 8 SUGGESTIONS FOR CHANGES TO THE MONITORING PROGRAMME ................................ 45 8.1 Summary of the current environmental monitoring programme ........................................... 45 8.2 Suggestions for changes ....................................................................................................... 46 9 ACKNOWLEDGEMENTS ............................................................................................................. 47 10 REFERENCES .............................................................................................................................. 48 TABLES Table 1 Typical food groups used in habits surveys Table 2 Ratios for determining consumption and occupancy rates for infants and children Table 3 Adults’ consumption rates of fish (kg y-1) Table 4 Adults’ consumption rates of crustaceans (kg y-1) Table 5 Adults’ consumption rates of molluscs (kg y-1) Table 6 Adults’ consumption rates of wildfowl (kg y-1) Table 7 Adults’ consumption rates of salt marsh grazed cattle meat (kg y-1) Table 8 Adults’ consumption rates of salt marsh grazed sheep meat (kg y-1) Table 9 Children's and infants’ consumption rates of fish (kg y-1) Table 10 Children's consumption rates of crustaceans (kg y-1) Table 11 Adults’ intertidal occupancy rates (h y-1) Table 12 Children’s and infants’ intertidal occupancy rates (h y-1) Table 13 Gamma dose rate measurements over intertidal substrates (µGy h-1) Table 14 Adults’ handling rates of fishing gear and sediment (h y-1) Table 15 Children’s handling rates of sediment (h y-1) Table 16 Adults’ occupancy rates in and on water (h y-1) Table 17 Children’s and infants’ occupancy rates in and on water (h y-1) ANNEXES Annex 1 Adults’ consumption rates (kg y-1) and occupancy rates (h y-1) Annex 2 Children’s and infants’ consumption rates (kg y-1) and occupancy rates (h y-1) Annex 3 Combinations of adult pathways for consideration in dose assessments Page 4 of 49 Radiological Habits Survey: Dumfries and Galloway Coast, 2012 SUMMARY This report presents the results of a survey conducted in 2012 to determine the habits and consumption patterns of people along the Dumfries and Galloway coast and the waters offshore, in order to determine the potential exposure pathways relating to authorised discharges of
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